求救! 有人會做這一條嗎?

蔽人在做題目, 很多也做錯了, 看完答案也不得其解. 其中一條是這樣的:

Historian:

We can learn about the medical history of individuals through chemical analysis of their hair. It’s likely, for example, that Issac Newton’s psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that his hypothesis is correct.

Which one of the following is an assumption on which the historian’s argument depends?

1. None of the mercury introduced into the body can be eliminated.

2. Some people in Beethoven’s time did not ingest mercury.

3. Mercury is an effective treatment for venereal disease.

4. Mercury poisoning can cause deafness in people with venereal disease.

5. Beethoven suffered from psychological problems of the same severity as Newton’s.

Source: 新東方

我選了A, 但答案是B, 為甚麼嗎?

Sorry... What question number? How can I make link?

it's a very loose weaken.eliminate other fator.

 if everyone digest mercury, how can u say B's containing of mercury was for the cure of verneral disease.